160 across the board is horrible for a GSR running stock compression. The motor is shot since compression should be at least 200 psi for each cylinder.

 

Really? Horry shit! Still it could of been a dry test. You're the GSR guru, you'd know better. Though my search turned up 160 as a good comp #. Oh well.

 

270 is what a new engine would test at, so 160 is a sign of blown rings, stuck valves, broken ringlands, and/or a blown head gasket.

Even with my blown rings, I was still getting dry compression numbers over 200 psi, so there is something definitely wrong.

 

:werd: sure is. Thanks for educating me :thumbup:

 

No production gasoline engine has 270 psi of compression. Here is what I printed off of alldata for your reference. I do like to see around 160-180, though.

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1995 Acura Integra (GS-R) L4-1797cc 1.8L DOHC (VTEC)
Vehicle Level Engine, Cooling and Exhaust Engine Compression Check Specifications


Specifications
Notes

Check compression with engine at normal operating temperature and throttle in wide open position. Prior to performing test, disable ignition and fuel injection to prevent fuel from being sprayed into cylinders while cranking engine. Ensure is fully charged and that cranking speed is 250 RPM. Standard reading should be 135-199 psi. The maximum variation between cylinders is 28 psi.












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Seeing that I have the 95 GSR Factory Service Manual right in front of me and it says the nominal psi is 270, the minimum is 140, and the maximum variation is 28, I think Alldata needs to research that a little harder.

Trust me, I have done several compression tests on my GSR and I have never seen a number lower than 200 psi, so I don't think 160 psi across the board means anything but a serious situation.

I think the information is meant for a lower compression LS motor, not a GSR because those numbers are way too low.

 

270psi??? Yeea right is all I have to say.

Alldata sounds much more accurate definitely for a dry test.

 

That is what it says in the service manual. For the LS, it says 199 is nominal.

Now that I think about it, it is really high and it may be a typo in the service manual. I am really confused. :dunno:

The bottom line is that 160 across the boards for a B18C1 is not a good thing regardless of whether the nominal psi is at 199 or 270.